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bug#23207: 25.1.50; file-notify event restarts the idle timer

From: Johan Claesson
Subject: bug#23207: 25.1.50; file-notify event restarts the idle timer
Date: Sun, 03 Apr 2016 15:22:05 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)


Every time there is a file-notify event the idle timer is restarted.
This will postpone the triggering of idle timers.  If there are
periodical file-notify events they may prevent idle timers from ever
triggering.  The following recipe creates periodical file-notify
events with the help of a normal non-idle timer.  The poor idle timer
started last in the recipe will never get to run.

emacs -Q

(with-current-buffer (find-file-noselect "/tmp/changing.txt")
  (setq auto-revert-interval 0.5)
(run-with-timer 1 1 (lambda () (write-region "x" nil "/tmp/changing.txt")))
(run-with-idle-timer 3 t (lambda () (message "Just idling")))

The same behavior is also present in 24.4 and 24.5 (i have not checked
older versions).

The idle timer gets restarted in read_char in keyboard.c.  The
following patch avoids this (but i am not sure it is the right
thing to do).

diff --git a/src/keyboard.c b/src/keyboard.c
index 1a5dbd0..b71c656 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -2834,7 +2834,9 @@ read_char (int commandflag, Lisp_Object map,
       last_input_event = c;
       call4 (Qcommand_execute, tem, Qnil, Fvector (1, &last_input_event), Qt);
-      if (CONSP (c) && EQ (XCAR (c), Qselect_window) && !end_time)
+      if (CONSP (c)
+          && (EQ (XCAR (c), Qselect_window) || EQ (XCAR (c), Qfile_notify))
+          && !end_time)
        /* We stopped being idle for this event; undo that.  This
           prevents automatic window selection (under
           mouse_autoselect_window from acting as a real input event, for

This is in the handing of special-event-map which includes
file-notify.  special-event-map includes some events that should
restart the idle timer because they are user input (like drag-n-drop).
But file-notify is not user input so i think it should not restart the
idle timer.

The same probably goes for dbus-event and config-changed-event that
also are in the special-event-map.  Maybe they also should be exempted
in the same way.

Also i don't understand why this code checks for Qselect_window.
select-window is not included in special-event-map so that should
never turn up there.



In GNU Emacs (x86_64-unknown-linux-gnu, X toolkit)
 of 2016-04-01 built on goblin
Repository revision: 46edc38005ce47bdaae656a541858735a8ba5f26
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:     Ubuntu 15.10

Configured using:
 'configure --prefix=/ssd/home/jcl/usr --with-x-toolkit=lucid
 --without-toolkit-scroll-bars --disable-silent-rules
 --without-compress-install --enable-link-time-optimization

Configured features:

Important settings:
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  magit-auto-revert-mode: t
  display-time-mode: t
  minibuffer-depth-indicate-mode: t
  num3-mode: t
  minibuffer-electric-default-mode: t
  icomplete-mode: t
  diff-auto-refine-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  wc-mode: t
  whitespace-mode: t
  winner-mode: t
  ido-everywhere: t
  which-function-mode: t
  global-eldoc-mode: t
  electric-layout-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  line-number-mode: t
  auto-fill-function: do-auto-fill
  transient-mark-mode: t

Recent messages:
Replaced 0 occurrences
Spell-checking region using aspell with default dictionary...done
Spell-checking suspended; use C-u M-$ to resume
Saving file /ssd/home/jcl/IDLE_TIMER_REPORT.el...
Wrote /ssd/home/jcl/IDLE_TIMER_REPORT.el
Saving file /ssd/home/jcl/IDLE_TIMER_REPORT.el...
Wrote /ssd/home/jcl/IDLE_TIMER_REPORT.el
Mark set
Saving file /ssd/home/jcl/IDLE_TIMER_REPORT.el...
Wrote /ssd/home/jcl/IDLE_TIMER_REPORT.el

Load-path shadows:
None found.

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Memory information:
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 (buffers 976 171)
 (heap 1024 216403 18278))

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